When a human skeleton is discovered in the trenches of an old Civil War battleground, Brennan and Booth are called to the case. Meanwhile, Booth's brother, Jared, returns from his travels with some surprising news.

An earthquake derails a DC subway train and a partially skeletonized body emerges out of the overflow. Sweets, who was on the train, deals with the post-traumatic stress of surviving the accident while a young man he talks to on the train dies next to him.